JDK 7: Shaped and translucent windows
By dannycoward on Aug 18, 2009
Just as life doesn't always fit neatly into a box, neither does everything you want to show on screen. Wanting to see behind what you're looking at is really just part of the human condition, and perhaps why the use of translucency in GUIs has become so popular.
The ability to create shaped and translucent windows was first released in Java SE 6u10, but you had to use a private API to do so. With the forward port of all the Java SE 6u10 features into the JDK 7 codebase, now you have a public API to do this.
This new article gives a 100% translucent picture of the capbilities, and is a good companion to this older, but recently updated technical article.